Return ERR_INVALID_RESPONSE when we get a funky error page mime-type.

content/browser/loader/resource_dispatcher_host_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1992 matching lines @@
 
   // Sorts out all the messages we saw by request.
   ResourceIPCAccumulator::ClassifiedMessages msgs;
   accum_.GetClassifiedMessages(&msgs);
 
   // We should have gotten one RequestComplete message.
   ASSERT_EQ(1U, msgs[0].size());
   EXPECT_EQ(ResourceMsg_RequestComplete::ID, msgs[0][0].type());
 
   // The RequestComplete message should have had the error code of
-  // ERR_FILE_NOT_FOUND.
-  CheckRequestCompleteErrorCode(msgs[0][0], net::ERR_FILE_NOT_FOUND);
+  // ERR_INVALID_RESPONSE.
+  CheckRequestCompleteErrorCode(msgs[0][0], net::ERR_INVALID_RESPONSE);
 }
 
 // Test for http://crbug.com/76202 .  We don't want to destroy a
 // download request prematurely when processing a cancellation from
 // the renderer.
 TEST_F(ResourceDispatcherHostTest, IgnoreCancelForDownloads) {
   EXPECT_EQ(0, host_.pending_requests());
 
   int render_view_id = 0;
   int request_id = 1;
@@ skipping 682 matching lines @@
     }
 
     base::MessageLoop::current()->RunUntilIdle();
 
     msgs.clear();
     accum_.GetClassifiedMessages(&msgs);
   }
 }
 
 }  // namespace content